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One ppm is equal to :

  • A.0.01%
  • B.0.1%
  • C.0.0001%
  • D.0.001%

Answer: C

One ppm equals 0.0001%.

Parts per million means 1 part in \(10^{6}\). Per cent means parts per hundred, so multiply the fraction by 100:

\[ \begin{aligned} 1\ \text{ppm} &= \frac{1}{10^{6}} \times 100\% \\ &= 10^{-4}\% = 0.0001\% \end{aligned} \]

Equivalently 1% = 10,000 ppm. The options 0.01%, 0.1% and 0.001% are 100 ppm, 1,000 ppm and 10 ppm respectively.

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